1. In 1983, President Ronald Reagan signed a bill designating the National Museum of American History as a separate entity within the Smithsonian Institution. The museum, located on the National Mall in Washington, D.C., is known for its extensive collections of artifacts related to American history and culture.

2. On June 30, 1864, Abraham Lincoln signed the Yosemite Grant Act, which set aside Yosemite Valley and the Mariposa Grove of giant sequoia trees as protected lands. This act is considered the first time the U.S. government set aside land for preservation and public use, and it paved the way for the national park system.

3. In 1963, civil rights leader Medgar Evers was assassinated outside his home in Jackson, Mississippi. Evers had worked for years to promote desegregation and voter registration in the South, and his death became a rallying point for activists in the struggle for civil rights.

4. Washington D.C. was officially established as the capital of the United States on June 30th, 1800. Prior to that, the nation’s capital was located in Philadelphia, but following the passage of the Residence Act, the city of Washington was created specifically to serve as the new capital.

5. On June 30, 1921, President Warren G. Harding signed the federal highway act into law, which provided funding for the construction of a national network of roads and highways. This act paved the way for the development of the modern American highway system, which greatly facilitated interstate travel and commerce.